OSM and the 500GB flyio/postgres size restriction

Hello, I am interesting in deploying a high availability postgres cluster with the planet OSM database to Fly.io. Disk requirements for the planet wide osm database is currently around 1.5TB. Unfortunately, it seems that the max disk space you can allocate to a postgres instance on fly is 500GB.

Is 500GB a hard limit? Is there any way to build a flyio/postgres instance with 2TB of disk space?

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Actually, it looks like the solution is to build an initial postgres cluster, then manually extend the pg_data volume beyond the initial limit. Any risk of doing so? Besides the cost?